/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.example.echo;

import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.concurrent.GlobalEventExecutor;

import java.nio.ByteBuffer;

/**
 * Handler implementation for the echo server.
 */
@Sharable
public class EchoServerHandler extends ChannelInboundHandlerAdapter {

    private static ChannelGroup clientChannels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        //保存用户状态（管道）
        Channel channel = ctx.channel();
        clientChannels.add(channel);

        ByteBuf byteBuf = (ByteBuf) msg;
        byte[] bytes = new byte[2048];
        byteBuf.readBytes(bytes, 0, 2048);
        System.out.println(bytes);
        ctx.write(msg);
        ReferenceCountUtil.release(byteBuf);//释放缓冲区
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        System.out.println("服务端：channelReadComplete");
//        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // Close the connection when an exception is raised.
        cause.printStackTrace();
        ctx.close();
    }
}
